SEO Head QA
HTML Head 公開前チェック
ページ HTML を貼り付け、検索、SNS共有、構造化データに影響する head タグを公開前に確認します。
チェック結果
HTML lang attribute is set
重要The root html element declares the page language.
enCharset is declared
重要The head includes a charset declaration, ideally UTF-8.
utf-8Viewport meta is present
重要Mobile rendering is controlled with a viewport meta tag.
width=device-width, initial-scale=1Title tag is present
重要The page has one readable title tag.
Launch Checklist for Indie Websites | tboxioTitle length fits search results
推奨The title is long enough to describe the page and short enough to avoid obvious clipping.
44 charsMeta description is present
重要The page has a meta description for search and sharing snippets.
Run a practical pre-launch checklist for SEO, Open Graph, Schema, sitemap, tracking, email, performance, and assets before going live.Meta description length is useful
推奨The description is specific and not obviously too short or too long.
134 charsCanonical URL is production-ready
重要A canonical link exists, uses HTTPS, and does not point to localhost or staging.
https://example.com/launch-checklistRobots meta allows indexing
重要The page is not accidentally blocked with noindex.
index,followOpen Graph tags are complete
推奨og:title, og:description, og:image, and og:url are present.
completeTwitter Card tags are complete
推奨twitter:card, twitter:title, twitter:description, and twitter:image are present.
completeJSON-LD structured data is valid
推奨Structured data scripts are present and parse as valid JSON.
1 JSON-LD script(s)Favicon is linked
推奨The head includes an icon link for browser tabs and bookmarks.
/favicon.icoTheme color is set
任意A theme-color meta tag helps mobile browser chrome match the brand.
#4f46e5抽出した Head データ
- lang
- en
- title
- Launch Checklist for Indie Websites | tboxio
- description
- Run a practical pre-launch checklist for SEO, Open Graph, Schema, sitemap, tracking, email, performance, and assets before going live.
- canonical
- https://example.com/launch-checklist
- robots
- index,follow
- viewport
- width=device-width, initial-scale=1
- charset
- utf-8
- favicon
- /favicon.ico
- theme-color
- #4f46e5
- JSON-LD
- 1
レポートプレビュー
# サイトページ HTML Head Preflight Report Score: 100/100 Passed: 14 Warnings: 0 Failed: 0 - ✓ HTML lang attribute is set — en - ✓ Charset is declared — utf-8 - ✓ Viewport meta is present — width=device-width, initial-scale=1 - ✓ Title tag is present — Launch Checklist for Indie Websites | tboxio - ✓ Title length fits search results — 44 chars - ✓ Meta description is present — Run a practical pre-launch checklist for SEO, Open Graph, Schema, sitemap, tracking, email, performance, and assets before going live. - ✓ Meta description length is useful — 134 chars - ✓ Canonical URL is production-ready — https://example.com/launch-checklist - ✓ Robots meta allows indexing — index,follow - ✓ Open Graph tags are complete — complete - ✓ Twitter Card tags are complete — complete - ✓ JSON-LD structured data is valid — 1 JSON-LD script(s) - ✓ Favicon is linked — /favicon.ico - ✓ Theme color is set — #4f46e5
Meta tag audit
Head Tag Checker
Check HTML head tags before launch. Audit title tags, meta descriptions, canonical URLs, robots directives, Open Graph, Twitter Cards, JSON-LD Schema, favicon, viewport, and language tags.
Title and description
Catch missing, duplicated, too-short, or weak metadata before the page is indexed.
Canonical and robots
Confirm canonical, robots, and JSON-LD signals do not contradict your launch goals.
Social preview readiness
Review Open Graph, Twitter Card, favicon, viewport, and language tags together.